Power-operated air-pump for automobiles



E. DAVID.

POWER OPERATED AIR PUMP FOR AUTOMOBILES.

APPLICATION FILED APR. 8, I920- Patnted May 10,1921.

I E. DAVID.

OPERATED AIR PUMP FOR AUTOMOBILES.

APPLICATION FILED APR. 8 I920.

POWER 1,377,403. Patented May 10, 1921.

2 SHEETS-SHEET 2- lhvanifi r' wa s l s /666$ QJ j LYmw/w UNITED STATES PATENT OFFICE.

ERNEST DAVID, OF MAYWOOD, ILLINOIS, ASSIGNOR OF ONE-THIRD TO HERMAN KRAUS, OF CHICAGO, ILLINOIS.

' Specification of Letters Patent.

Patented May 10, 1921.

Application filed April 8, 1920. Serial No. 372,143.

To all whom it may concern:

Be it known that I, ERNEST DAVID, a citizen of the United States residing at Maywood, in the county of (look and State of Illinois, have invented certain new and useful Improvements in Power-Operated Air- Pumps for Automobiles, of which the following is a' specification.

This invention relates to pumps'for inflating the tires of motor vehicles, and has Y be thrown into and out of driven relation to the motor.

Other objects are, to provide a piimp which may be readily detached or removed, when necessary; to provide a pump that shall not require lubrication; to provide a driving mechanism that can be operated directly from the engine shaft; to provide a driving mechanism that can be-thrown into and out of operation by the manipulation of a cam lever; and to provide certain detail improvements in the pump itself.

' Still other objects and advantages of the invention will be apparent to those skilled in the art as the same becomes better understood by reference to the following description, taken in connection with the accompanying drawings in which I have illusseated in the saddle 23, and, as best shown trated a practical and preferred embodiment of the invention and in which- Figure 1 is a top plan view of my improved pump and of the parts of an automobile with which it is directly associated;

Fig. 2 is a longitudinal section through the pump cylinder and piston;

Fig. 3 is a transverse section on the line 3-3 of Fig. 2;

Fig. 4 is a transverse section of the pump piston or plunger taken in a plane at right angles to that of Fig. 2;

Fig. 5 is a transverse section taken on the line 5-5 of Fig. 2;

Fig. 6 is a side elevation, partly in section, of the parts shown in Fig. 1;

I Fig. 7 7 7 of Fig. 6; and,

1g. 8 is a horizontal section of the comblned dr ve pulley of the fan and pump.

Referring to the drawings, 10 designates the engine shaft, 11 the fan shaft, 12 the fan, 13 and 14 the fan driving pulleys fast on the engine shaft 10 and the fan shaft 11, respectlvely, 15 the fan driving belt and 16 one of the channel side sills of the chassis frame of aFord car.

17 designates a bracket arm formed with an integral square shank 18 that fits withinthe channel side sill 16, being secured in.

the latter by a vertical through-bolt 19. In order to hold the bracket arm 17 rigid against side play, set screws 20 and 21 are passed through the shank 18 on opposite sides of the vertical bolt 19, the inner ends of these set screws abutting against the vertical wall of the side sill 16.

Mounted on the bracket arm 17 by a hori zontal pivot bolt 22 is a saddle 23 conveniently formed of thick sheet metal, the opposite sides of the saddle being cut to provide a pair of downwardly bent supporting arms 24 apertured at their lower ends to receive the pivot bolt 22, and two pairs of upwardly extending clamping arms 25 which embrace the pump cylinder and are drawn together above the latter by clamp bolts 26. The metal of which the saddle 23 is formed is sufliciently flexible to enable the clamping arms 25 to be spread apart sufiiciently for the passage of the cylinder between them when the clamp bolts 26 have been removed.

27 designates the pump cylinder that is nected, by a pivot pin 36, to a pair of lugs 3'1 on the back of a metal piston disk 38, between which latter and a metal cup 39 is clamped the piston cup-leather 40, the parts municates with 38, 39, and 40 being united by a pair of screws 41 (Fig. 4c). The opening 42 in the disk 38, formed by bending up the pivot lugs 37, communicates with an opening 43 in the cup-leather 40, and the opening 4;?) coma central hole 44:: in the metal cup 39. This hole'44 is covered by a disk check-valve 45 that is confined in working position by a keeperring 46, formed with radial lugs 47 (Fig. 2) that are attached to the metal cup 39 by small screws 48. Leakage of air between the cylinder 27 and its head 29 is guarded against byan annular internal packing ring 49 of solder or like material.

The other cylinder head 28 is formed with a transverse slot 50 to accommodate the play of the piston-rod 35, and it is also provided,

on opposite sides of the slot 50, with holes v 51 in which latter are slidably mounted a. pair of piston guide-rods 52 that are rigidly mounted at their inner ends in the piston, and serv to hold the latter against the tilting tendency caused by the alternate push and pull of the swinging piston rod or pitman 35. On the cylinder head 29 is mounted a delivery nozzle 53 to which is attached a hose 54: of sufficient length to reach all of the four tires of the vehicle.

On the fan pulley 13, and preferably integral therewith and just forwardly thereof is a grooved pulley "55 that is connected by a belt 56 with the pump pulley 32. In order to tighten the belt 56 for, driving the pump, there is pivotally mounted at 57 (Fig. 6) on the free end of the bracket arm 17, a cam 58 that underlies the cylinder head 28, said cam being provided with an operating handle 59, and with a stop shoulder 60. When the cam is swung tothe position shown in 6, the pump cylinder is rocked on its pivot 22 sufficiently to tighten the belt 56 and effect the actuation of the pump.- Except when the pumpis operat ing, it 1s necessary to 1nterrupt the drive between the pulleys 55 and 32, and this is etfected by-mean's of a thrust bolt'61 slidably mounted in a countersunk hole in the bracket 17 and bearing against the cylinder head 29; the bolt being normally thrust upwardly by a compression spring 62 encircling it and confined between the head of the bolt and the bracket arm 17. Obviously,

the normal tendency of the spring bolt is to tilt the pump cylinder in a direction to slacken the belt 56, just as soon as the cam 58 is moved to idle position, which is effected by swinging the handle 59 to the left in Fig. 6.

For the exclusion of dust and dirt, the driving connections between the pulley 32 and-the pump plunger are covered by a crank case or housing 63 shown in Figs. 1 and 6 which is mounted on the cylinder pressed air is needed for any other pur- I pose, the cam, handle is swung to the position shown in Fig. 6, thereby establishing a power transmission from the engine shaft to the pump through the tightening of the belt 56. lVhen the pump is no longer required, and the car is being driven, the controlling cam is in its inoperative position, the belt 56 is slack, and the pump is idle.

It is manifest that the details of construction herein shown and described may be variously modified without departing from the:

substance of the invention or sacrificing any of the advantages thereof. Hence,-I reserve all such modifications as fall within the spirit and purview of the appended claims.

I claim- I I .1. In an air pump for automobiles, the combination of a bracket, means for attaching said bracket to a side sill of the chassis frame, a saddle pivotally mounted on said bracket, a pump cylinder removably mounted in said saddle and having a cylinder head formed with a rigid rearward extension, a

shaft journaled in said extension, a crank on one end of said shaft connected to the piston rod of the pump, the otherend of said shaft, a driving pulley a pulley fast on fast on the engine shaft, a belt connecting said pulleys, and manually operated means for tightening and slackening saidbelt. e

2. In an air pump for automobiles, the

combination of a bracket, means for attaching said bracket to a side slllof the chassis frame, a pump cylinder mounted on said bracket and formed witha -rigid rearward extension, a shaft'journaled in said extension, a crank on one end of said shaft connected to the piston rod of the pump, driving mechanism between the other end of said shaft and the engine shaft, and a crank case secured to the rear end of said cylinder and inclosing said crank and piston rod.

'3. In an a1r pump for automobiles, the

frame, a saddle transversely pivoted on said bracket, a pumpcylinder removably mountcombination of a bracket, means for attach .ing said bracket to a side $111 of the chassis ed in said saddleand formed with a rigid rearward extension, a shaft journaled in said extension, a crank on one end of said shaft connected to the piston rod of the pump, a pulley fast on the other endof said shaft, a driving pulley fast on the engine shaft, a belt connecting said pulleys, and a manually operated cam for rocking said saddle on its pivot whereby to bodily shift said first named pulley away from said driving pulley whereby to tighten said belt.

4. In an alr pump for automobiles, the combination of a bracket, means for attaching said bracket to a side sill of the chassis frame, a saddle transversely pivoted on said bracket, a pump mounted in said saddle and formed with a rigid rearward extension, a shaft journaled in said extension, a crank on one end of said shaft connected to the piston rod of the pump, a pulley fast on the other end of said shaft, a driving pulley fast on the engine shaft, a belt connecting said pulleys, a compression spring between said bracket and one end of said pump tend ing .to rock the latter in a dlrlection [[30 slacken said belt, and a manually operable cam between said bracket and the other end of said pump serving to rock the latter in a direction to tighten said belt.

5. In an air pump for automobiles, the combination with a pump cylinder, of a bracket for supporting the same from the channel side sill of a chassis frame, said bracket having a shank fitted Within said channel side sill, a vertical bolt passed through said side sill and shank, and setscrews passed through said shank and abutting against the vertical wall of said side sill on oppositesides, respectively, of said vertical bolt to hold said bracket against lateral movement.

' ERNEST DAVID. 

